Hi Edwin,

>I believe that a drop-down list also recognizes CTRL+0, displays a value set by SET NULLDISPLAY and writes an empty string to its control source.

It does indeed, any control does this but hardly any developer takes this into account. Most VFP application can easily be crashed by pressing Ctrl+0, including most components of Visual FoxPro that are written in VFP. Just try it with the Class Browser or the Setup Wizard. *g*

Christof